I have placed custom buttons on the base layer of a Master Slide. When I preview or publish the buttons, they do not display properly. The buttons are made up of a rectangle with an additional graphical element added into the various states. It is these additional elements that do NOT display. They do, however, display when I put the buttons on a layer other than the base layer.
I've reinstalled Storyline AND I've recreated this on a brand new version of a file, so it is repeatable across Storyline versions and different files.